Preheat oven to 350 degrees. Spray a nonstick 12 cup Bundt pan with baking spray; set aside.,In a large mixing bowl, mix together the flour, sugar, spices, salt & baking soda. In a separate mixing bowl, combine oil, buttermilk and eggs. Whisk together and add to flour mixture; mix just until combined. Add in chopped bananas and walnuts; stir gently to blend.,Pour batter into prepared pan and bake until toothpick inserted into center comes out clean and cake has puuled away from edge of pan, about 55 minutes.,______,Place on a pretty cake plate Dust with confectioners' sugar, if desired. Serve with a dollop of whipped cream - Yummy!